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  • GEOPHYSICS  (322)
  • AERODYNAMICS  (162)
  • ASTRONOMY
  • ENERGY PRODUCTION AND CONVERSION
  • SOLAR PHYSICS
  • 1980-1984
  • 1975-1979  (354)
  • 1970-1974  (290)
  • 1975  (354)
  • 1972  (290)
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  • 1980-1984
  • 1975-1979  (354)
  • 1970-1974  (290)
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  • 1
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    An investigation of several numerical procedures for time-asymptotic compressible Navier-Stokes solutions (1975)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The status of an investigation of four numerical techniques for the time-dependent compressible Navier-Stokes equations is presented. Results for free shear layer calculations in the Reynolds number range from 1000 to 81000 indicate that a sequential alternating-direction implicit (ADI) finite-difference procedure requires longer computing times to reach steady state than a low-storage hopscotch finite-difference procedure. A finite-element method with cubic approximating functions was found to require excessive computer storage and computation times. A fourth method, an alternating-direction cubic spline technique which is still being tested, is also described.
    Schlagwort(e): AERODYNAMICS
    Materialart: Aerodynamic Analyses Requiring Advanced Computers, Pt. 1; p 437-468
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Simultaneous solar-wind plasma and magnetic-field measurements in the expected region of the extended geomagnetic tail. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 77; Sept. 1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Periodic variations in stratospheric meridional wind from 20 to 65 km - 80 N to 70 S (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Long-term periodic features in the meridional wind between 20 and 65 km attitude are analyzed. No appreciable periodic waves are found in the tropics. The quasi-biennial oscillation, annual wave, and four-month wave have maximum amplitudes of about 10, 20, and 10 m/s respectively in the arctic near 45 km. The phase of the annual wave changes by nearly 180 deg in a narrow zone near 45 deg N. The semiannual wave has an amplitude of 10 m/s near 50 deg N above 50 km with equinoctial phase dates in the region of maximum amplitude. The location of this polar semiannual wave corresponds closely to that previously found in the zonal wind.
    Schlagwort(e): GEOPHYSICS
    Materialart: Royal Meteorological Society; vol. 101
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Coronal changes associated with a disappearing filament (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Skylab/ATM observations of a disappearing filament near the center of the solar disk are described using XUV and H-alpha spectroheliograms, X-ray filterheliograms, and photospheric magnetograms. The temperature of the coronal plasma as the filament disappeared is estimated to have been in excess of 6 million K, and it is noted that the time history of the soft X-ray and microwave fluxes displayed the gradual-rise-and-fall (GRF) signature, suggesting that the present event may have properties that are characteristic of a wide class of long-duration X-ray and radio events. A comparison with other spatially resolved long-duration X-ray events indicates that all such long-lived bursts involve transients in the outer corona and that some two-thirds of them involve either the eruption or the major activation of a prominence. It is also found that long-lived events are characterized by the appearance of new emission loops in the lower corona during the declining phase of the X-ray emission and that these loops sometimes disappear after the X-ray events and sometimes remain indefinitely.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics; 45; Dec. 197
    Format: text
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  • 5
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    Development and evaluation of a new method for predicting aircraft buffet response (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The buffet prediction method uses rigid wind tunnel model fluctuating pressure data to form a buffet forcing function. The response is then calculated with a mathematical dynamic model of the airplane developed for gust response analysis. By including the extremes of phasing and contribution of symmetric and antisymmetric airplane responses, the upper and lower bounds are established for buffet response. F-111A flight test data show good agreement with predicted bounds for a variety of flight conditions.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA PAPER 75-69 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 20, 1975 - Jan 22, 1975; Pasadena, CA
    Format: text
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  • 6
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    Design requirements for operational earth resources ground data processing (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Realistic tradeoff data and evaluation techniques were studied that permit conceptual design of operational earth resources ground processing systems. Methodology for determining user requirements that utilize the limited information available from users is presented along with definitions of sensor capabilities projected into the shuttle/station era. A tentative method is presented for synthesizing candidate ground processing concepts.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-CR-129605
    Format: application/pdf
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  • 7
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    Automatic N(h,t) profiles of the ionosphere with a digital ionosonde (1972)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-12
    Beschreibung: A method is described to accomplish automatic data selection and profile inversion to obtain ionospheric electron density profiles from digitized radio soundings. The profile inversion is based on a well-established formulation by which the optimum radio frequency sounding intervals can be specified from an approximate knowledge of the profile; the expected virtual height coordinates (h) at these frequencies (f) are estimated, and procedures are then used to select h(f) observations nearest the predicted coordinates from a subsequent digital ionogram. From these the next profile is obtained. The process adaptively follows the changing shape and detail of the profile. The procedure requires an average of 15 sec per profile on a standard data processing computer, and can be adapted, with benefit to online real-time use in a digital ionosonde.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Math. of Profile Inversion; 11 p
    Format: text
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  • 8
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    Flap noise generation and control (1972)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-27
    Beschreibung: The characteristics of aerodynamic noise generated by the interaction of an airstream with a flap surface are discussed. The location and behavior of various noise sources were investigated to determine optimal quieting techniques. A schematic diagram of the jet-flap concepts being considered for integrated-powered-lift systems for short takeoff aircraft is shown. Each of the concepts has in common high velocity turbulent air flowing over relatively rigid surfaces with resultant production of interaction noise. The nature, location, and control of noise sources which involve the interactions of air flows with airfoil surfaces are examined.
    Schlagwort(e): AERODYNAMICS
    Materialart: STOL Technol.; p 413-426
    Format: text
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  • 9
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    Acoustic characteristics of large-scale STOL models at forward speed (1972)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-27
    Beschreibung: Wind-tunnel investigations of the acoustic characteristics of the externally blown jet flap (EBF) and augmentor wing STOL concepts are discussed. The large-scale EBF model was equipped with a triple-slotted flap blown by four JT15D turbofan engines with circular, coannular exhaust nozzles. The large-scale augmentor wing model was equipped with an unlined augmentor blown by a slot primary nozzle. The effects of airspeed and angle of attack on the acoustics of the EBF were small. Flap deflection had a greater effect on the acoustics of the augmentor wing than did airspeed. The total sound power was also significantly higher for landing indicating that turning in the augmentor generated acoustic energy. Airspeed produced a small aft shift in acoustic directivity with no significant change in the peak perceived noise levels or sound power levels. Small-scale research of the acoustics for the augmentor wing has shown that by blowing an acoustically treated augmentor with a lobed primary nozzle, the 95-PNdb noise level goal can be achieved or surpassed.
    Schlagwort(e): AERODYNAMICS
    Materialart: STOL Technol.; p 443-454
    Format: text
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  • 10
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    Simulator evaluation of the flying qualities of externally blown flap and augmentor wing transport configurations (1972)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-27
    Beschreibung: Concurrent simulations of powered-lift STOL transport aircraft having either an externally blown flap configuration or an augmentor wing configuration were conducted. The following types of simulators of varying sophistication were used: (1) a simple fixed-base simulation with a simple visual display, (2) a more complex fixed-base simulation using a realistic transport cockpit and a high-quality visual display, and (3) a six-degree-of-freedom motion simulator that had a realistic transport cockpit and a sophisticated visual display. The unaugmented flying qualities determined from these simulations were rated as unacceptable for both the externally blown flap and augmentor wing configurations. The longitudinal, lateral-directional, and single-engine-failure characteristics were rated satisfactory with extensive augmentation, including pitch and roll command systems, flight-path (or speed) augmentation, turn coordination, and effective yaw damping. However, the flare and landing characteristics from any approach glide-path angle in excess of 4 deg were rated as unsatisfactory but acceptable.
    Schlagwort(e): AERODYNAMICS
    Materialart: STOL Technol.; p 157-800
    Format: text
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